JP2536605Y2 - Cylinder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder in which a piston is movably accommodated in a cylindrical cylinder case, and an end cover is fitted to an open end of the cylinder case.

[0002]

2. Description of the Related Art In a conventional cylinder of this type, an end cover is fixed to a cylinder case by the following fixing structure.

First, in the first fixing structure, from the flange portion of the end cover to the open end of the cylinder case,
A plurality of screw holes extending in the movement direction of the piston are formed,
The screws are screwed into these screw holes, so that the end cover is fixed to the cylinder case. next,
In the second fixing structure, a male screw is formed on the outer peripheral surface of the fitting portion of the end cover, and a female screw is formed on the inner peripheral surface of the open end of the cylinder case. As a result, the end cover is fixed to the cylinder case.

[0004] In the third fixing structure, the end cover is crimped over the entire circumference in a state where the end cover is fitted into the open end of the cylinder case. It is fixed to the cylinder case.

Further, in the fourth fixing structure, a stop ring is attached to the outside of the cylinder case in a state where the end cover is fitted into the open end of the cylinder case, so that the end cover is fixed to the cylinder case so as not to come off. ing.

In the fifth fixing structure, the two parts are fitted together with an adhesive applied to the outer peripheral surface of the fitting part of the end cover or the inner peripheral surface of the open end of the cylinder case. The end cover is adhesively fixed to the cylinder case.

Further, in the conventional cylinder, a plurality of through holes extending in a direction perpendicular to the moving direction of the piston are formed in the cylinder case and the end cover. Then, by inserting bolts into the through-holes in a state where a plurality of cylinders are stacked, the cylinders are connected and fixed in a stacked state, or bolts are inserted through the through-holes while the cylinders are placed on the mounting plate. Thus, the cylinder was fixed to the mounting plate.

[0008]

However, each of the conventional fixing structures in the cylinder has the following problems. First, in the first fixing structure, it is necessary to increase the thickness of the cylinder case in order to form the screw hole, and there is a problem that the entire cylinder becomes large. Next, in the second fixing structure, there is a problem that the cross-sectional shape of the fitting portion of the end cover is limited to a circle, and the second fixing structure cannot be applied to those having a different shape such as a square. Also, the third
Also in the fixing structure described above, there is a problem that the cross-sectional shape of the fitting portion of the end cover is limited to a circular shape in consideration of airtightness.

Further, the fourth fixing structure has a problem that the cross-sectional shape of the fitting portion of the end cover is limited to a circle and the end cover is not sufficiently fixed to the cylinder case. In the fifth fixing method, if grease or the like adheres to the bonding surface, there is a possibility that poor bonding may occur. Therefore, it is necessary to clean the bonding surface neatly, and there is a problem that the operation is troublesome. Was.

Further, in the conventional cylinder, since it is necessary to provide a plurality of through holes for inserting bolts so as not to interfere with the structure for fixing the end cover to the cylinder case, there is a problem that the entire cylinder becomes large. there were.

The present invention has been made by focusing on the problems existing in such conventional techniques, and the first is
The object of the present invention is that the whole shape can be reduced in size, and the cross-sectional shape of the fitting portion of the end cover is not limited to a circle, but can be applied to a different shape such as a square. Another object of the present invention is to provide a cylinder capable of easily and firmly fixing an end cover to a cylinder case.

A second object of the present invention is that a connecting pin for fixing the end cover to the cylinder case can be used as a bolt insertion hole, so that the structure is simple and the whole shape is smaller. An object of the present invention is to provide a cylinder which can be used as a cylinder.

Further, a third object of the present invention is to provide a cylinder in which piping to a fluid supply / discharge port can be intensively performed on one side of a cylinder case.

[0014]

In order to achieve the first and second objects, according to the invention, a piston is movably accommodated in a cylindrical cylinder case, and the cylinder case is provided. In a cylinder having an end cover fitted to the open end of the cylinder case and the end cover, a through hole extending in a direction perpendicular to the direction of movement of the piston is formed in the cylinder case and the end cover, and a cylindrical coupling pin is fitted into the through hole, Both ends of the coupling pin are swaged.

In order to achieve the first to third objects, according to the present invention, a piston is movably housed in a cylindrical cylinder case having one end opened,
In a cylinder in which an end cover is fitted to an open end of a cylinder case, a through-hole extending in a direction perpendicular to a moving direction of a piston is formed in the cylinder case and the end cover, and a cylindrical coupling pin is fitted in the through-hole. The first and second fluid supply / discharge ports are formed at the closed end of the cylinder case, and the first port is opened to one of the cylinder chambers. Is connected to a supply / discharge pipe that penetrates the piston and projects and opens into the other cylinder chamber.

[0016]

In the cylinder according to the first and second aspects of the present invention, with the end cover fitted to the open end of the cylinder case, a cylindrical coupling pin is inserted into the through-hole and the coupling is performed. By caulking the both ends of the pin, the end cover can be easily and firmly fixed to the cylinder case.

Therefore, unlike the fixing structure in which the end cover is screwed to the open end of the cylinder case, the size of the entire cylinder can be reduced. Further, as in the fixing structure in which the end cover is screwed and fixed to the cylinder case, the cross-sectional shape of the fitting portion of the end cover is not limited to a circle, but can be applied to a quadrangular shape or the like. .

Further, when connecting a plurality of cylinders in a stacked state or mounting the cylinders on a mounting plate, a cylindrical coupling pin having an end cover fixed to a cylinder case is used as a bolt insertion hole. can do. Therefore, it is not necessary to separately form a bolt insertion hole near the coupling pin, so that the structure is simple and the overall shape can be further reduced.

Further, in the cylinder according to the second aspect, since the first and second fluid supply / discharge ports are centrally arranged on one side of the cylinder case, piping for the fluid supply / discharge ports is required. , Can be concentrated on one side of the cylinder case.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a cylinder embodying the present invention will be described below.
An embodiment will be described in detail with reference to FIGS.

As shown in FIGS. 1 to 3, the cylinder case 1 is formed in a rectangular tube shape, and one end thereof is opened.
The piston 2 is movably accommodated in the cylinder case 1, cushion plates 3 are provided on both side surfaces thereof, and a piston packing 4 is attached to the outer periphery. A pair of piston rods 5 extend to one side of the piston 2,
It protrudes outward from the cylinder case 1.

The end cover 6 is fitted to the open end of the cylinder case 1, and has a pair of rod insertion holes 7 through which the piston rod 5 is inserted. The rod packing 8 is attached to the outer end of each rod insertion hole 7 by a holding plate 9 to maintain the airtightness in the cylinder case 1.

The mounting plate 10 is fixed between the distal ends of the piston rods 5 by nuts 11. At both ends, a pair of screw holes 12, 13 extending in the direction of movement of the piston 2 and in the direction orthogonal thereto are formed. I have. Then, screws are screwed into the screw holes 12 and 13 so that the mounting plate 10 is
, A driven member (not shown) can be fixed.

As shown in FIGS. 1, 2 and 4, the pair of through holes 14 extend parallel to the direction perpendicular to the direction of movement of the piston 2 so that the open end of the cylinder case 1 and the end cover 6 extend. Are formed at both ends of the through hole 14 on the cylinder case 1 side. The cylindrical coupling pin 16 is inserted into each through hole 14,
Both ends are inclined and caulked along the tapered portion 15.

As shown in FIGS. 2 and 3, the first fluid supply / discharge port 17 is formed near one side of the closed end of the cylinder case 1, and the inner end thereof is connected to one end of the cylinder case 1. It is open to the cylinder chamber C1. The second fluid supply / discharge port 18 is formed at the center of the closed end of the cylinder case 1 so as to be adjacent to the first fluid supply / discharge port 17. The supply / discharge pipe 19 is connected to the inner end of the second port 18, penetrates through the through hole 20 of the piston 2, and projects and opens to the other cylinder chamber C <b> 2 in the cylinder case 1.
The seal ring 21 is fitted in the through hole 20 to maintain airtightness between the two cylinder chambers C1 and C2.

As shown in FIGS. 1 and 2, a pair of bolt insertion holes 22 are formed in the closed end of the cylinder case 1 corresponding to the connecting pins 16, and are parallel to a direction orthogonal to the moving direction of the piston 2. Extends to. In a state where a plurality of cylinders are stacked as shown in FIG. 5 or in a state where the cylinders are mounted on the mounting plate 23 as shown in FIG. Is inserted and tightened with the nut 25, whereby the cylinders can be connected and fixed in a stacked state, or can be mounted and fixed on the mounting plate 23.

Next, the operation of the above-configured cylinder will be described. FIGS. 1 and 2 show a state in which the piston 2 is moved toward the closed end of the cylinder case 1 and the piston rod 5 is immersed in the cylinder case 1. In this state, when a pressurized fluid such as air is supplied from the first fluid supply / discharge port 17 into one of the cylinder chambers C1, the piston 2 is moved to the left in FIG.
The piston rod 5 projects from inside the cylinder case 1. When the pressure fluid is supplied into the other cylinder chamber C2 from the second fluid supply / discharge port 18 via the supply / discharge pipe 19 in a state where the piston rod 5 projects, the piston 2 moves to the right in FIG. The piston rod 5 is immersed in the cylinder case 1.

When the end cover 6 is attached to the open end of the cylinder case 1 in the cylinder of this embodiment, the end cover 6 is fitted to the open end of the cylinder case 1 as shown in FIG. After that, cylindrical coupling pins 16 are inserted into the through holes 14. Then, by crimping both ends of the coupling pin 16 along the tapered portion 15 of the through hole 14, the end cover 6 can be easily and firmly fixed to the cylinder case 1.

Therefore, according to this embodiment, unlike the conventional fixing structure in which the end cover 6 is screwed to the open end of the cylinder case 1, the overall shape of the cylinder can be reduced. Further, unlike the conventional fixing structure in which the end cover 6 is screwed and fixed to the cylinder case 1, the cross-sectional shape of the fitting portion of the end cover 6 is not limited to a circle, but may be a square or other irregular shape. Can be applied.

Further, when connecting a plurality of cylinders in a stacked state as shown in FIG. 5, or when mounting the cylinders on a mounting plate 23 as shown in FIG. 6, the end cover 6 is attached to the cylinder case 1. Fixed cylindrical coupling pin 1
6 can be used as a bolt insertion hole. Accordingly, there is no need to separately form a bolt insertion hole near the coupling pin 16, and the structure is simple and the overall shape can be further reduced.

Further, in the cylinder of this embodiment, the first and second fluid supply / discharge ports 17 and 18 are centrally arranged on one side of the cylinder case 1, so that these fluid supply / discharge ports 17 , 18 can be concentrated on one side of the cylinder case 1.

[0032]

Next, another embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. First, in the second embodiment shown in FIG. 7, the tapered portions 15 are not formed at both ends of the through hole 14 on the cylinder case 1 side. For this reason, both ends of the connecting pin 16 are caulked substantially at right angles along both side surfaces of the cylinder case 1.

Next, in a third embodiment shown in FIGS. 8 and 9, the end cover 6 is formed in a cylindrical shape, and is fitted to the cylindrical open end of the cylinder case 1. . Then, as in the first embodiment described above, the through hole 1
The end cover 6 is fixed to the cylinder case 1 by inserting the connecting pin 16 into the 4 and crimping both ends of the connecting pin 16.

In the fourth embodiment shown in FIG. 10, two cylinder chambers are formed in the cylinder case 1,
A cylindrical end cover 6 is fitted to the open end of each cylinder chamber. Then, similarly to the third embodiment described above, these end covers 6 are separately fixed to the cylinder case 1 by a pair of connecting pins 16.

Further, in the fifth embodiment shown in FIGS. 11 and 12, as in the fourth embodiment, two cylinder chambers are formed in the cylinder case 1, and each cylinder chamber has an open end. The cylindrical end covers 6 are fitted with each other. A groove-shaped through-hole 14 is formed on the outer periphery of each end cover 6, and one connecting pin 14 is inserted from the through-hole 14 of the cylinder case 1 into the through-groove 14 of both end covers 6, and the connection is made. By caulking both ends of the pin 16, both end covers 6 are simultaneously fixed to the cylinder case 1.

It should be noted that the present invention is not limited to the above-described embodiment, and may be configured, for example, as follows without departing from the spirit of the present invention. (1) Both ends of the cylinder case 1 are opened, and the end covers 6 are fitted and fixed to the opening portions at both ends.

(2) As shown in FIG.
To be formed.

[0038]

[Effects of the Invention] The present invention has the following advantages because it is configured as described above.

According to the first and second aspects of the present invention, the shape of the entire cylinder can be reduced, and the cross-sectional shape of the fitting portion of the end cover is not limited to a circle. The end cover can be easily and firmly fixed to the cylinder case.

According to the first and second aspects of the present invention, the connecting pin for fixing the end cover to the cylinder case can be used as a bolt insertion hole, and the structure is simple. The overall shape can be further reduced.

Further, according to the invention of claim 2,
The fluid supply / discharge port is centrally arranged on one side of the cylinder case, so that piping to the fluid supply / discharge port can be concentrated on one side of the cylinder case.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of a cylinder embodying the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a right side view of the cylinder of FIG. 1;

FIG. 4 is a partial sectional view showing an exploded configuration of an end cover attached to a cylinder case.

FIG. 5 is a front view showing a state in which a plurality of cylinders shown in FIG. 1 are stacked and connected.

FIG. 6 is a front view showing a state where the cylinder is mounted on a mounting plate.

FIG. 7 is a partial sectional view showing a second embodiment of the cylinder of the present invention.

FIG. 8 is a partial sectional view showing a third embodiment of the cylinder of the present invention.

FIG. 9 is a sectional view taken along line BB of FIG. 8;

FIG. 10 is a side sectional view showing a fourth embodiment of the cylinder of the present invention.

FIG. 11 is a side sectional view showing a fifth embodiment of the cylinder of the present invention.

FIG. 12 is a perspective view showing an end cover of a cylinder according to a fifth embodiment of the present invention.

FIG. 13 is a sectional view showing another example of a cylinder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylinder case, 2 ... Piston, 6 ... End cover, 14 ... Through-hole, 16 ... Connection pin, 17 ... 1st fluid supply / discharge port, 18 ... 2nd fluid supply / discharge port, 19 ...
Supply / discharge pipe, C1 ... one cylinder chamber, C2 ... the other cylinder chamber.

Claims (2)

(57) [Scope of request for utility model registration] 1. A cylinder in which a piston is movably accommodated in a cylindrical cylinder case, and an end cover is fitted to an open end of the cylinder case. The cylinder case and the end cover are orthogonal to the direction of movement of the piston. A cylinder having a through-hole extending in a direction, a cylindrical connecting pin inserted into the through-hole, and both ends of the connecting pin caulked. 2. A cylinder in which a piston is movably accommodated in a cylindrical cylinder case having one end opened, and an end cover is fitted to an open end of the cylinder case. A through hole extending in a direction perpendicular to the direction is formed, a cylindrical coupling pin is inserted into the through hole, and both ends of the coupling pin are caulked, and first and second ends are formed in a closed end of the cylinder case.
A first port is opened in one cylinder chamber, and a second port is connected to a supply / discharge pipe that penetrates a piston and projects and opens into the other cylinder chamber. And cylinder.